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Best way to count document in Flutter OPT2

Edgar Nyambo answered on February 5, 2023 Popularity 1/10 Helpfulness 1/10

answer Best way to count document in Flutter OPT2

related Best way to count document in Flutter OPT 3

Best way to count document in Flutter OPT2

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export const documentWriteListener = functions.firestore
  .document('collection/{documentUid}')
  .onWrite((change, context) => {

    if (!change.before.exists) {
      // New document Created : add one to count
      db.doc(docRef).update({ numberOfDocs: FieldValue.increment(1) });
    } else if (change.before.exists && change.after.exists) {
      // Updating existing document : Do nothing
    } else if (!change.after.exists) {
      // Deleting document : subtract one from count
      db.doc(docRef).update({ numberOfDocs: FieldValue.increment(-1) });
    }

    return;
  });

Popularity 1/10 Helpfulness 1/10 Language whatever

Source: stackoverflow.com

Tags: count document flutter whatever

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Contributed on Feb 05 2023

Edgar Nyambo

0 Answers Avg Quality 2/10

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Best way to count document in Flutter OPT 3

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const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp();

exports.aggregateComments = functions.firestore
    .document('posts/{postId}/comments/{commentId}')
    .onWrite(event => {

    const commentId = event.params.commentId; 
    const postId = event.params.postId;
    
    // ref to the parent document
    const docRef = admin.firestore().collection('posts').doc(postId)
    
    // get all comments and aggregate
    return docRef.collection('comments').orderBy('createdAt', 'desc')
         .get()
         .then(querySnapshot => {

            // get the total comment count
            const commentCount = querySnapshot.size

            const recentComments = []

            // add data from the 5 most recent comments to the array
            querySnapshot.forEach(doc => {
                recentComments.push( doc.data() )
            });

            recentComments.splice(5)

            // record last comment timestamp
            const lastActivity = recentComments[0].createdAt

            // data to update on the document
            const data = { commentCount, recentComments, lastActivity }
            
            // run update
            return docRef.update(data)
         })
         .catch(err => console.log(err) )
});

Popularity 1/10 Helpfulness 1/10 Language javascript

Source: fireship.io

Tags: flutter javascript count document

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Contributed on Feb 05 2023

Edgar Nyambo

0 Answers Avg Quality 2/10

Best way to count document in Flutter OPT2

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